<style>
.div {
  font-size: 20px;
}
.div .bbb {
  color: yellow;
}
.abc {
  color: blue;
}
.a:hover {
  color: aqua;
}
</style>
<div class="div" :class="{ abc: true }">
  123
  <div class="bbb">
    bbb
    <a href="javascript:void(0)">sldfkasdfl</a>
    <input/>
    <img>
  </div>
</div>
